@article{GAMA_1960_1960_1_a1,
     author = {Etayo, Jos\'e Javier},
     title = {Teor{\'\i}a intr{\'\i}nseca de tensores.},
     journal = {Gaceta matem\'atica},
     pages = {71-88},
     publisher = {mathdoc},
     volume = {12},
     number = {1-2},
     year = {1960},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/GAMA_1960_1960_1_a1/}
}